IOTA/IOTA-ES occultation update for (2355) Nei / TYC 7423-01511-1 event on 2024 Nov 10, 18:09 UT Visible from Summary ------- On 2024 Nov 10 UT, the 16.457 km diameter asteroid (2355) Nei will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.78 mag to 17.38 mag (the magnitude of the asteroid) for at most 0.490 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 94 * date and approx. time of event: 2024 Nov 10, 18:06 - 2024 Nov 10, 18:13 * geocentric midpoint of event [JD]: 2460625.25692779 * magnitude of target star: 11.61 * magnitude drop [mag]: 5.78 * estimated maximum duration [s]: 0.490 * Moon: 67 % sunlit, 51° distance * Sun: 59° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 88°) * approx speed of asteroid's shadow [km/s]: 33.7461 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7423-01511-1 by 2355 Nei on 2024 Nov 10 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -119 0 0 3 52 48 18 6 56.7 1 121 59 3 47 25 3 58 11 3 42 37 4 2 59 .... -118 0 0 3 17 26 18 6 56.8 2 121 60 3 12 4 3 22 48 3 7 17 3 27 35 -0.09 -117 0 0 2 42 25 18 6 57.0 3 121 61 2 37 4 2 47 46 2 32 18 2 52 33 -0.17 -116 0 0 2 7 47 18 6 57.2 4 121 62 2 2 27 2 13 7 1 57 41 2 17 53 -0.20 -115 0 0 1 33 31 18 6 57.5 5 121 63 1 28 12 1 38 50 1 23 27 1 43 35 -0.22 -114 0 0 0 59 39 18 6 57.9 6 121 64 0 54 21 1 4 58 0 49 37 1 9 42 -0.23 -113 0 0 0 26 12 18 6 58.4 8 121 65 0 20 55 0 31 29 0 16 12 0 36 13 -0.24 -112 0 0 - 0 6 50 18 6 59.0 9 121 66 - 0 12 6 - 0 1 33 - 0 16 48 0 3 9 -0.24 -111 0 0 - 0 39 25 18 6 59.6 10 121 67 - 0 44 41 - 0 34 10 - 0 49 22 - 0 29 28 -0.25 -110 0 0 - 1 11 34 18 7 0.3 11 121 69 - 1 16 48 - 1 6 19 - 1 21 29 - 1 1 39 -0.25 -109 0 0 - 1 43 15 18 7 1.1 12 121 70 - 1 48 28 - 1 38 1 - 1 53 8 - 1 33 21 -0.25 -108 0 0 - 2 14 27 18 7 1.9 13 121 71 - 2 19 40 - 2 9 15 - 2 24 18 - 2 4 36 -0.25 -107 0 0 - 2 45 11 18 7 2.9 14 121 72 - 2 50 23 - 2 40 0 - 2 55 0 - 2 35 22 -0.26 -106 0 0 - 3 15 25 18 7 3.8 15 121 73 - 3 20 36 - 3 10 15 - 3 25 13 - 3 5 38 -0.26 -105 0 0 - 3 45 10 18 7 4.9 17 121 74 - 3 50 19 - 3 40 0 - 3 54 55 - 3 35 24 -0.26 -104 0 0 - 4 14 23 18 7 6.0 18 121 75 - 4 19 32 - 4 9 15 - 4 24 7 - 4 4 39 -0.26 -103 0 0 - 4 43 6 18 7 7.2 19 121 75 - 4 48 14 - 4 37 59 - 4 52 48 - 4 33 24 -0.26 -102 0 0 - 5 11 17 18 7 8.5 20 121 76 - 5 16 24 - 5 6 11 - 5 20 57 - 5 1 37 -0.26 -101 0 0 - 5 38 57 18 7 9.8 21 121 77 - 5 44 2 - 5 33 51 - 5 48 35 - 5 29 18 -0.27 -100 0 0 - 6 6 4 18 7 11.2 22 121 78 - 6 11 8 - 6 0 59 - 6 15 40 - 5 56 27 -0.27 - 99 0 0 - 6 32 38 18 7 12.6 23 121 79 - 6 37 42 - 6 27 35 - 6 42 12 - 6 23 4 -0.27 - 98 0 0 - 6 58 40 18 7 14.1 24 120 79 - 7 3 42 - 6 53 37 - 7 8 12 - 6 49 7 -0.27 - 97 0 0 - 7 24 8 18 7 15.7 25 120 80 - 7 29 10 - 7 19 6 - 7 33 39 - 7 14 37 -0.27 - 96 0 0 - 7 49 3 18 7 17.3 26 120 80 - 7 54 4 - 7 44 2 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 7423-01511-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 18 47.8910 DE: -30 36 51.621 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 18 47.8908 DE: -30 36 51.621 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2355) Nei asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.08730 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.017", 0.002", 87.653° remarks: * orbital elements for (2355)Nei : Mean anomaly = 338.8495834968 deg Arg. of pericenter = 278.4007425023 deg Long. of node = 53.7822500768 deg Inclination = 9.9946766131 deg Eccentricity = 0.1119813612 Semimajor axis = 3.0218904655 AU Perihelion dist = 2.6834950578 AU Mag: H = 11.82, G = 0.15 Epoch of elements : MJD 60624.75692755 TDT (2024 Nov 10.7569) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.49,2024,11,10,18.166267,-0.052030,0.268571,18.696247,3.639830,0.004973,0.000244,-0.000001,0.000000 -32.7940,-30.5708,-96.49,-17.43,False TYC 7423-01511-1,19.31330311,-30.6143391,11.94,11.61,11.43,0.0,0,,19.33942006,-30.5708282,5.77,5.50,0,0,0 2355,Nei,17.38,16.457,3.0873,0,0,4.124,10.37,,2.0,0 0,338.7076,2024,11,10,278.4007,53.7823,9.9947,0.11198,3.02189,2.68350,11.82,5.0,0.15 1.446,0.0167,0.0021,88,0.0033,Known errors,0.82,0,-1,-1 20241110_1511-1,60140.69 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org